Global Patent Index - EP 0838940 A3

EP 0838940 A3 19990210 - Multiple spatial channel processing

Title (en)

Multiple spatial channel processing

Title (de)

Verarbeitung mittels mehrerer räumlicher Kanäle

Title (fr)

Traitement utilisant plusieurs canaux spatiaux

Publication

EP 0838940 A3 19990210 (EN)

Application

EP 97308307 A 19971020

Priority

US 73189396 A 19961022

Abstract (en)

[origin: EP0838940A2] In a multiple spatial channel technique for a digital continuous-tone output quality from an output device having a large, dilute dot channel, referred to as the L (lowpass) channel, and a small, concentrated dot channel, referred to as the N (noisy) channel, two images are computed for the two channels using a matrix of image luminance values (raster). The apparatus comprises channel extractors (120, 130) and respective channel-associated image generators (140, 150). The N and L channel images are formed by eroding sides of edges in the input image which have a contrast above a Darticular threshold.

IPC 1-7

H04N 1/405

IPC 8 full level

B41J 2/52 (2006.01); G06T 5/00 (2006.01); H04N 1/23 (2006.01); H04N 1/405 (2006.01); H04N 1/409 (2006.01)

CPC (source: EP US)

H04N 1/4057 (2013.01 - EP US)

Citation (search report)

Designated contracting state (EPC)

AT BE CH DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

DOCDB simple family (publication)

EP 0838940 A2 19980429; EP 0838940 A3 19990210; EP 0838940 B1 20051228; DE 69734962 D1 20060202; DE 69734962 T2 20060803; JP H10150573 A 19980602; US 5920653 A 19990706

DOCDB simple family (application)

EP 97308307 A 19971020; DE 69734962 T 19971020; JP 28953397 A 19971022; US 73189396 A 19961022